Hardware Android

package app.test;
//This file is MainActivity.java
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;
public class Test extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        TextView text = (TextView)findViewById(R.id.text);
        SensorManager mgr = (SensorManager) this.getSystemService(SENSOR_SERVICE);
        List sensors = mgr.getSensorList(Sensor.TYPE_ALL);
        StringBuilder message = new StringBuilder(2048);
        message.append("The sensors on this device are:\n");
        
        for(Sensor sensor : sensors) {
          message.append(sensor.getName() + "\n");
          message.append("  Type: " + sensorTypes.get(sensor.getType()) + "\n");
          message.append("  Vendor: " + sensor.getVendor() + "\n");
          message.append("  Version: " + sensor.getVersion() + "\n");
          message.append("  Resolution: " + sensor.getResolution() + "\n");
          message.append("  Max Range: " + sensor.getMaximumRange() + "\n");
          message.append("  Power: " + sensor.getPower() + " mA\n");
        }
        text.setText(message);
    }
    
    private HashMap sensorTypes = new HashMap();
    { // Initialize the map of sensor type values and names
      sensorTypes.put(Sensor.TYPE_ACCELEROMETER, "TYPE_ACCELEROMETER"); // 1
      sensorTypes.put(Sensor.TYPE_GYROSCOPE, "TYPE_GYROSCOPE"); // 4
      sensorTypes.put(Sensor.TYPE_LIGHT, "TYPE_LIGHT"); // 5
      sensorTypes.put(Sensor.TYPE_MAGNETIC_FIELD, "TYPE_MAGNETIC_FIELD"); // 2
      sensorTypes.put(Sensor.TYPE_ORIENTATION, "TYPE_ORIENTATION"); // 3
      sensorTypes.put(Sensor.TYPE_PRESSURE, "TYPE_PRESSURE"); // 6
      sensorTypes.put(Sensor.TYPE_PROXIMITY, "TYPE_PROXIMITY"); // 8
      sensorTypes.put(Sensor.TYPE_TEMPERATURE, "TYPE_TEMPERATURE"); // 7
    sensorTypes.put(Sensor.TYPE_GRAVITY, "TYPE_GRAVITY"); // 9
        sensorTypes.put(Sensor.TYPE_LINEAR_ACCELERATION,
                              "TYPE_LINEAR_ACCELERATION"); // 10
        sensorTypes.put(Sensor.TYPE_ROTATION_VECTOR,
                              "TYPE_ROTATION_VECTOR"); // 11
    }
}
//main.xml

    android:orientation="vertical"
    android:layout_width="fill_parent"  android:layout_height="fill_parent" >
      android:layout_width="fill_parent"  android:layout_height="wrap_content" />